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Which of the following species paticipate in sulphonation of benzene ring ?

(a) H2SO4

(b) SO3

(c) HSO3-

(d) SO2-

1 Answer

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Best answer

Correct option (b) SO3

Explanation:

Most electrophilic substitution reactions are irreversible but sulphonation is an exception. Treatment of benzene with "oleum" (a solution of SO3 in conc. sulphuric acid) will give the sulphonic acid. the electrophile is sulphur trioxide (SO3). 

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